INSTALLATION & OPERATING

WARNING: If these instructions are not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.

WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency or
the gas supplier.

This manual should be maintained in legible condition and kept adjacent to the heater or in a safe place for future
reference.
Catalog No. 6000.59Z

Effective: 06-28-13

Replaces: 01-16-12

P/N 241236 Rev. 27

WATER CHEMISTRY
(Corrosive water voids all warranties)

For your health and the protection of your pool equipment, it is essential that your
water be chemically balanced. The following levels must be used as a guide for balanced water.
Recommended Level(s)
Water Temp. (Deg. F)
pH

Total Alkalinity (PPM)

Calcium Hardness (PPM)
Salt (PPM)

Free Chlorine (PPM)*

Fiberglass Pools

Fiberglass Spas

Other Pool & Spa
Types

7.3 to 7.4

7.3 to 7.4

7.6 to 7.8

68 to 88

89 to 104

120 to 150

120 to 150

4500 MAXIMUM

4500 MAXIMUM

200 to 300
2 to 3

150 to 200
2 to 3

Total Dissolved Solids (PPM) 3000 MAXIMUM** 3000 MAXIMUM**

* Free Chlorine MUST NOT EXCEED 5 PPM!

68 to 104
80 to 120

200 to 400

4500 MAXIMUM
2 to 3

3000 MAXIMUM**

** In salt water chlorinated pools, the total TDS can be as high as 6000 ppm.
•

•

•

Occasional chemical shock dosing of the pool or spa water should not damage the
heater providing the water is balanced.
Automatic chemical dosing devices and salt chlorinators are usually more efficient
in heated water, unless controlled, they can lead to excessive chlorine level which
can damage your heater, and which is not covered under warranty. A check
valve should be installed between the heater outlet and a chlorinator or other chemical dosing device.
Further advice should be obtained from your pool or spa builder, accredited pool
shop, or chemical supplier for the correct levels for your water.

FOR YOUR SAFETY - READ BEFORE OPERATING
WARNING: IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION MAY
RESULT, CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.

SECTION 1 - START-UP PROCEDURES

Your pool/spa heater has been designed for years of safe and reliable pool/spa water heating. It is available with
millivolt or electronic ignition. ASME-certified units, typically used in commercial applications, are also available.
This manual provides installation, operation, maintenance, and service information for these heaters.

ON

OFF

If your heater has been installed correctly, operating the heater is an easy task. The upper front panel of the
heater contains the control center that allows you to turn the heater On or Off and adjust the temperature settings for the pool or spa. The temperature range is factory set from 65°F (18°C) to 104°F (40°C). See figure
above for location of toggle switch to turn the heater On and Off. Section 4 of this manual contains more details
about the use of the controls in the Control Adjustments subsection (page 32).

BEFORE START-UP

BURNERS

WATER

Clean main burners, combustion fan (if equipped)
and air louvers of dust, lint and debris. Keep
heater area clear and free from combustibles, flammable liquids and chemicals. Do not obstruct the flow of
combustion and ventilation air.

Water must be flowing through the heater during operation. Ensure that the system is filled with water and
that the pump is operating.

4

CAUTION: Propane gas is heavier than air and will settle on the ground. Since propane can accumulate in
confined areas, extra care should be exercised when lighting propane heaters.
LIGHTING INSTRUCTIONS AND SHUT-OFF PROCEDURES

MILLIVOLT SYSTEM

A.
B.

(MANUALLY LIGHTED PILOT)

*If you cannot reach your gas supplier, call the
fire department.

This appliance has a pilot that must be lit by
hand. When lighting the pilot, follow these
instructions exactly.

C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob will
not push in or turn by hand, do not try to repair
it. Call a qualified service technician. Force or
attempted repair may result in a fire or explosion.

BEFORE LIGHTING, smell all around the
appliance area for gas. Be sure to smell near
the floor because some gas is heavier than air
and will settle on the floor.

D. Do not use this appliance if any part has been
under water. Immediately call a qualified service technician to inspect the appliance and to
replace any part of the control system and any
gas control which has been under water.

WHAT TO DO IF YOU SMELL GAS:
*Do not try to light any appliance.
*Do not touch any electric switch; do not use
any phone in your building.
*Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.

LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Set the thermostat on the lowest setting.
3. Turn On/Off switch to the "Off" position.
4. Remove heater door panel.
5. Push in gas control knob slightly and turn
clockwise
to "Off".
NOTE: Knob cannot be turned from "Pilot" to Off"
unless knob is pushed in slightly. Do not
force.
6. Wait 5 minutes to clear out any gas. If you
ROBERTSHAW PILOT
HONEYWELL PILOT
then smell gas, STOP! Follow "B" in the
safety information above. If you don't smell
8. Turn gas control knob counter-clockwise
gas, go to the next step.
to "Pilot"
7. Locate pilot mounted on the right side panel of
9.
Place
flame
to end of pilot tube. Push in
the burner tray.
control knob all the way and hold to light pilot.
Continue to hold control knob in for about one
HONEYWELL
minute after the pilot is lighted, release knob
MILLIVOLT
and it will pop back up. Pilot should remain
GAS VALVE
lighted. If it goes out, repeat steps 5 through 9.
If knob does not pop up when released, stop
and immediately call your service technician or
gas supplier.
10. Stand to the side of the heater and turn the
gas
control
knob
counter-clockwise
to "On".
INVENSYS/
11. Replace heater door panel.
ROBERTSHAW
12. Turn On/Off switch to the "On" position.
MILLIVOLT
13. Set thermostat to the desired setting.
GAS VALVE
1.
2.
3.

Force or
attempted repair may result in a fire or
explosion.
*Immediately call your gas supplier from a
neighbor's phone.
1. Immediately call a qualified
service technician to inspect the appliance and
to replace any part of the control system and
any gas control which has been under water. Do
not try to light the pilot by hand. If you don't smell gas. follow the
INLET
instructions "To Turn Off Gas To Appliance"
and call your service technician or gas
supplier.
For Robertshaw valve: Models 266-406:
Turn gas control knob clockwise
to
ROBERTSHAW 7000
"Off".
6.
12.
7000 gas valve. STOP! Follow "B" in the safety information above.
to "Off".
*Do not touch any electric switch.
4. Follow the gas supplier's
instructions.
For Honeywell valve: Turn gas control knob
clockwise
to "Off". call the
fire department.
VALVE IID
This appliance is equipped with an ignition
device which automatically lights the pilot. Do
GAS
INLET
not try to light the pilot by hand.
D.
This appliance is equipped with an ignition
device which automatically lights the pilot.
1.
OPERATING INSTRUCTIONS AND SHUT-OFF PROCEDURES
ELECTRONIC IGNITION SYSTEM
(AUTOMATICALLY LIGHTED PILOT)
A.
Set thermostat to desired setting.GAS VALVE IID
trol lever counter-clockwise
to "Off"
position. If the knob will
not push in or turn by hand.
Turn on all electrical power to the appliance.
Use only your hand to push in or turn the gas
control knob. smell all around the
appliance area for gas.
4.
BEFORE OPERATING.
8.
HONEYWELL
Set the thermostat to the lowest setting.
B.
O
9.
7. Make sure knob rest against stop. extra care should be exercised when lighting propane heaters.
OPERATING INSTRUCTIONS
STOP! Read the safety information above. (Honeywell VR 8300 and
IN
“OFF”
Robertshaw 7000)
POSITION
Replace heater door panel.
GAS CONTROL
Turn gas control knob counter-clockwise
LEVER SHOWN
to "On".
5.
*If you cannot reach your gas supplier.
2.
6
.
Do not use this appliance if any part has been
under water. Call a qualified service technician. go
ROBERTSHAW 7200
to the next step. do not use
any phone in your building.
SHUT-OFF PROCEDURES
Set the thermostat at the lowest setting. Never use tools. Be sure to smell near
the floor because some gas is heavier than air
and will settle on the floor. If you
then smell gas.
GAS
If the appliance will not operate.
For Honeywell VR 8300 and Robertshaw
5.
10.
ance if service is to be performed.
Turn off all the electrical power to the appliFor Robertshaw 7200 gas valve.
WHAT TO DO IF YOU SMELL GAS:
*Do not try to light any appliance.
C.
Wait 5 minutes to clear out any gas.
2.
VR 8300 GAS
Turn off all electrical power to the appliance.
Turn gas control knob clockwise
F
O
3.
11.
Remove heater door panel.
Push in and move gas control lever counterRemove heater door panel. Model 206: Push in and move gas con. do not try to repair
it.
3.
clockwise
to "Off" position. Replace heater door panel.CAUTION: Propane gas is heavier than air and will settle on the ground. Since propane can accumulate in
confined areas.

turn off the manual gas control
to the heater.
A yellow or "floating" flame indicates restricted air
openings or incorrect orifice size.
.AFTER START-UP
Feel the inlet and outlet pipes.
4" MAX
SECTION 2 . should not use spas or hot tubs. Spa water temperatures should never exceed
104°F (40°C). Drinking of alcoholic beverages before or during
spa or hot tub use can cause drowsiness which
could lead to unconsciousness and subsequently
result in drowning. users should
check the water temperature with an accurate thermometer. Persons with a medical history of heart disease.
Refer to Pressure Switch
Adjustment on pg.
5.
VISUAL INSPECTION . A temperature of 100°F (38°C) is
considered safe for a healthy adult. Special caution
is suggested for young children.
4.
WATER PRESSURE SWITCH
A water pressure switch is provided in the heater to
shut off the burners in the event that water supply is
interrupted. Pregnant
women should stick to the 100°F (38°C) maximum
rule. Outlet pipe should be
only slightly warmer than the inlet. antihistamines. 38 of this manual). circulatory problems. Consumer Product Safety Commission has these
guidelines:
MAIN BURNER FLAME
1. Before entering the spa or hot tub.
rapid and severe damage will likely occur to the
heater. It is very important to verify that the switch
electrically opens and shuts off the gas valve when
water flow to the heater is interrupted. diabetes. Otherwise. The flame should be
blue with a well-defined pattern. or blood pressure
problems should obtain a physician's advice before
using pools or hot tubs.
WARNING: Operation of the heater without water
circulation will cause rapid and severe damage to
the heater. remove the door and make a visual check of the pilot and burner.ATMOSPHERIC HEATERS
With the heater on. spa or hot tub thermostats may err in regulating water temperatures by as much as 4°F
(2. Should this occur.2°C). It should not be hot. and will void the warranty. or anticoagulants.
2.
shut the heater off and contact your installer or gas
supplier.CAUTION
Elevated water temperature can be hazardous. (The water pressure switch should be checked
and adjusted for proper operation by a qualified service person at the time of installation and periodically
checked thereafter.
MILLIVOLT PILOT BURNER FLAME
3. The
U.
WARNING: Should overheating occur or the gas
supply fail to shut off. such as tranquilizers.S.
7
6. Persons taking medications which induce drowsiness. Pregnant Women Beware! Soaking in water over
102°F (39°C) can cause fetal damage during the
first three months of pregnancy resulting in the birth
of a brain-damaged or deformed child.

it may be that your
"circuit breaker" has tripped. Inspect and operate all controls.
5. Maintain
your water chemistry according to the chart on page 2.SECTION 3 .
LO NOx BURNERS
If you have electrical power but the heater will not fire
check the following or see Troubleshooting section:
The Lo NOx burners and orifice areas should be
inspected annually. Your filter may be dirty.
2. Low flame means low
gas pressure.
1. High chemical concentrations will
result when the pump is not running (e. Dirt and debris can affect the
operation of the heater and could damage the burners
or prevent the heater from firing. Do not use
steel wire brush. Make visual check of the burner and pilot flames. Such damage is not
covered under the warranty. (To tell if your filter is dirty.
IF HEATER WILL NOT FIRE:
If you have no electrical power.
NOTE: High chemical concentrates from feeders and
chlorinators that are out of adjustment will cause rapid
corrosion to the heat exchanger.
To be followed one month after start-up and then semiannually. Try re-setting it.
4. The time clock must be in the "ON" position. then you are not moving water (or your
gauge is broken). clean room intake openings to
ensure adequate flow of combustion and ventilation air. The pump may have lost its prime and be running
dry. scale forms inside the heat exchanger tubes. Yellow flame means restriction
of the air openings.
See plumbing diagrams on page 24. Should the latter occur. shut the
heater off and contact your gas supplier or qualified service agency.
Chlorinators must feed downstream of the heater and
have an anti-siphoning device to prevent chemical
back-up into the heater when the pump is shut off.
WARNING: Check the heater for possible rodent
nests after long periods of non-use. Keep area around heater clear and free from combustible materials. gas valve and
pressure relief valve (if equipped). overnight). Clean main burners and pilot burner of dust and
lint. and open flue gas passageways. a
sticky black substance around finned tubes and
"V" baffles. Your pump strainer basket may be full. Wet sooted
surfaces completely prior to cleaning.
1. If the pH drops below 7. Check the pressure on the filter. gasoline and other flammable
and corrosive vapors and liquids.2.
3.
If the mineral content and dissolved solids in the water
become too high. this will cause corrosion of the heat exchanger and severely damage the
heater.
CAUTION: Soot may be combustible.
8
. backwash or clean
filter. Inspect top of heater and drafthood for soot.
6.
CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage
the heater and void the warranty. look to see if the
filter pressure will be higher than usual). Heat exchanger damage resulting from
chemical imbalance is not covered by the warranty. If so. reducing heater efficiency and damaging the
heater.
Flame pattern on the main burner and pilot is illustrated on page 7.MAINTENANCE AND
CARE PROCEDURES
2.
If so
3. Any
visible soot should be cleaned for proper operation.g.
AUTOMATIC CHLORINATORS AND
CHEMICAL FEEDERS
All chemicals must be introduced and completely diluted into the pool or spa water before being circulated
through the heater. Do not place sanitizing chemicals
in the skimmer. A
check valve should be installed between the heater
outlet and the chlorinator. On indoor heaters. If there is no
pressure.
4.
POOL & SPA WATER CHEMISTRY
Chemical imbalance can cause severe damage to
your heater and associated equipment. Lifting or blowing flame indicates high gas pressure.
remove debris. DO NOT clean the
burners with a wire brush. Try to get the pump to run at its
normal flow rate.

When temperatures
are between 0° and 32°F.
9
. Continuous
pump operation is a must. Open drain plug on return header. Open drain plug located on the inlet/outlet header.
Return Header
COLD CLIMATE: Prolonged operation with water
temperatures below 50°F is not recommended. Operating the
heater for prolonged periods with pool water below
50°F can seriously damage the heater. and is not covered by the warranty. The heater is not warranted against
freeze-ups. flow (continuous pump
operation) must be maintained.
For cold climate areas. manual gas valve.
1.
care must be taken to avoid freeze-ups. Additional protection may
be required. Observe the following procedure for winterizing the heater:
MODERATE CLIMATE: Heater operation can continue during short-term cold spells.
(under water pipes). please follow the winterizing
procedures listed. Turn off gas valve. Remove the heat exchanger
inspection panel on the side opposite water piping
to gain access to the drain plug on the return header.
Drain Plug
3. operate the heater continuously until
higher temperatures are reached.WINTERIZING THE POOL & SPA HEATER
COLD WEATHER OPERATION
IMPORTANT FREEZE INFORMATION
Heaters installed outdoors in freezing climate areas
may be shut down for the winter. and electrical supply to the heater.
When starting the heater with water temperatures
below 50°F.
2. When heater is used during freezing weather.
CAUTION: Do not use the heater to maintain water
temperatures just above freezing or for freeze protection. For ASME Heaters only: Disconnect compression
fittings from the pressure switch and return header
that connects to the 1/4" copper tube and allow the
tube to drain.

STANDARD UNIT (POLYMER HEADERS)
"Pagoda" top
2" CPVC union with "O" rings (2)
Plastic pipe finish flange for gas line
Bonding lug with mounting screw
(AFT models only)
1.
4.RECEIVING EQUIPMENT
The manufacturer recommends that this manual be reviewed thoroughly before installing your pool/spa heater.
If there are any questions that this manual does not answer.
4.
3.
can also be found inside
the bezel above the display
Model & Serial No. See below for location of
serial number.
3. you must specify the model and serial numbers of the heater. If it is damaged.
When ordering parts. Save the carton. please contact the factory or your local representative.
ASME UNIT (CAST IRON HEADERS)
"Pagoda" top
In/Out flanges (2)
1-1/2" flange gaskets (2)
2" flange gaskets (2)
Flange bolts (4)
Pressure relief valve
2" CPVC adapters (2)
Plastic pipe finish flange for gas line.
The Model & Serial No.
10
.
(AFT models only)
Be sure that you receive the number of packages indicated on the Bill of Lading. When ordering under warranty conditions.
These items are shipped inside a box in the carton with the heater:
1.
Bonding lug with mounting screw.PART TWO
INSTALLATION AND SERVICE INSTRUCTIONS
SECTION 1 .
7. report the damage to the carrier immediately. Remove the
heater from the carton. If the
carton is damaged.
On receipt of your equipment it is suggested that you visually check for external damage to the carton.
2.
5. a note should be made on the Bill of Lading when signing for the equipment.
8.
Located on Rating
Plate
(Alternate Location)
LABEL ON CARTON
Serial No.
2. you must also specify date of installation.
6.
9.

INSTALLATION INSTRUCTIONS
CALIFORNIA PROPOSITION 65 WARNING: This product contains chemicals known to the State of California
to cause cancer. explosion or fire.
CODE REQUIREMENTS
NOTE: The heater should not be located in an area where possible water leakage will result in damage to the
area adjacent to the heater or to the structure. When such locations cannot be avoided. and for
Canada.SECTION 2 . consult the factory. When cleaning spills. in the absence of local codes. If necessary. take precautions to avoid creating airborne dust and avoid
inhaling airborne fibers.000 feet above sea level. to
avoid inhalation of airborne dust and airborne fiber particles. and Canadian Electrical Code. ANSI/NFPA 70. with the latest edition of
the National Fuel Gas Code. specifically trained and experienced in the installation of this type of heating equipment and related system components. with adequate drainage. Wear appropriate personal protective equipment
including gloves. be sure your contractor bears the appropriate license. or. birth defects or other reproductive harm. and appropriate NIOSH certified respiratory protection. If your state is such.
When removing the burners or heat exchangers. alteration. Use feasible engineering controls such as local exhaust ventilation
or dust collecting systems to minimize airborne dust.7
Standard for Gas-Fired Pool Heaters.
Lo NOx heaters:
Rated inputs are suitable for up to 5. as high elevation reduces combustion performance.
SECTION 3 . For elevations above 5000 feet. reduce input 4% for
each 1. and will void the warranty. safety glasses with side shields. adjustment. the RCF can transform into crystalline silica (cristabolite).
Ambient Temperature Rating of Heater Components
+32°F to +175°F
Millivolt Heater with Honeywell Gas Valve
Millivolt Heater with Robertshaw Gas Valve 0°F to +175°F
Electronic Ignition Heater*
-32°F to + 175°F
*Requires 120 or 240VAC Power Supply
Atmospheric heaters:
Rated inputs are suitable for up to 2. create a hazard resulting in asphyxiation.1 Part
1 and Part 2.
WARNING: This unit contains refractory ceramic fiber (RCF) insulation in the combustion chamber.
WARNING: Improper installation. the top can be changed at a later date to change from
outdoor to indoor or vice versa.
11
. The International
Agency for Research on Cancer (IARC) has classified the inhalation of crystalline silica (cristabolite) as carcinogenic to humans. does not contain respirable crystalline silica. the latest edition of CAN/CSA-B149 Installation Codes. use wet sweeping or High Efficiency Particulate Air (HEPA)
filtered vacuum to minimize airborne dust. Installation
and service personnel may be required by some states to be licensed. service or maintenance may damage the equipment.000 feet elevation.1/NFPA54 and National Electrical Code. The pan must not restrict combustion air flow. Persons not qualified shall not attempt to fix this equipment nor attempt
repairs according to these instructions.
Installation must be in accordance with local codes. However. ANSI Z223. be installed under the heater. RCF.25 and . The appropriate top
designated for each type of use is required. as
manufactured. Millivolt heaters contain a self-generating electrical system operating between
. For elevations above 2000 feet. All heaters can be used either indoor or outdoors. following sustained exposure to very
high temperatures (>2192F).75 VAC.000 feet elevation. CSA C22.56 / CSA 4.
IMPORTANT NOTICE
These instructions are intended only for the use by qualified personnel. it is recommended that
a suitable drain pan.GENERAL SPECIFICATIONS
These heaters are design-certified and tested under the latest requirements of the ANSI Z21.

and at least 18" on the
water connection side.
*Clearance from top of vent terminal.6”
Left Side . Insert tabs into keyhole (4 places). Snap tabs into keyholes so as not to pull out.Unobstructed (Outdoor Stack)
Top*** .0”
Right Side . and void the warranty.
12
.
**Do not install on carpeting.6”
(Opposite Water Side)
FLOORING: This heater can be installed on combustible flooring.36” (Stackless Top)
Floor . see the
chart below.
WARNING: The heater shall not be located in an area where water sprinklers.6”
Left Side . In either case.
WARNING: Do not install within 3 feet of a heat pump or an outdoor condensing unit. the pool heater
can still be serviced without removing permanent
construction around the heater. or other devices.12” (Water Side)
Back .6”
Floor** . we recommend a clearance of at least 24” in the front. This could cause internal rusting or damage
electrical components. may cause
water to spray through the cabinet louvers and into the heater.CLEARANCES
ALL HEATERS
For clearances from combustible surfaces.
OUTDOOR HEATER INSTALLATION
These heaters are design-certified for outdoor installation. may require
removal of the heater to service either the heat
exchanger or the burner tray. that is. when equipped with the approved tops designated for
outdoor use.
INDOOR INSTALLATIONS:
Top* .12” (Water Side)
Vent .0”
(Opposite Water Side)
Clearances less than these (6” minimum).30” (Drafthood) Back . the
heater must be installed in a manner that will enable
the heater to be serviced without removing any structure around the heater.
CLEARANCE FROM
COMBUSTIBLE CONSTRUCTION
However for ease of servicing. Strong air intake from
this type of equipment can disturb the combustion process and cause damage or personal injury.
HEATER WITH OUTDOOR STACKLESS TOP
Pagoda Top Installation
1.Alcove (Open) Right Side .
***Clearance from top of heater.
Pagoda Top
Pagoda Top
(Shipped inside
box in heater
carton)
2. This will enable the heater to
be serviced in its installed location.
When installed according to the listed minimum clearances from combustible construction.6”
Front .
OUTDOOR INSTALLATION:
Top* . without
movement or removal of the heater.

installations. Three sides
must be open in the area under the overhang. Refer to the latest revisions of CAN/CSA-B149.
For U. or intake ducts located within 10 ft horizontally. Roof water drainage must be diverted away from the heaters
installed under overhangs with the use of gutters. The top surface of the
heater shall be at least 3 ft above any forced air inlet.
For installations in Canada.Heaters must not be installed under an overhang of less than three 3 ft from the top of the heater. the point from where the flue products exit the heater must be a minimum of 4 ft below. or to either side. window or gravity inlet into any building. that must comply with the Florida or Texas Building Code.S.
4 ft
Minimum
4 ft
Minimum
4 ft
3 ft
Minimum
Minimum
1 ft
10 ft
Minimum
Minimum
Forced Air Inlet
For installations in Florida and Texas. or 1 ft above any door.
4 ft horizontally from. follow the
directions on page 14 for the installation of hurricane tie-down brackets for all models. pool heaters shall not be installed with the top of the vent assembly within 10 ft
below. of any opening into the building.
13
.

The
unit.57. per ft rise and should be supported at not more than five foot intervals. the vent pipe must have
a minimum of 1/4 in. Plumbers tape. 6000. the vent pipe size may be reduced as specified in Chapter
10 of the National Fuel Gas Code.1 (Canada .
Vent piping the same size as the drafthood outlet is recommended.
Model
Power Vent Kit
206/207
266/267
336/337
406/407
120 VAC
Part No.
Optional Raypak D-2
Power Vent
For more information consult the D-2 Power Vent manual. will serve to space both horizontal and vertical piping.
18
. All Air From Inside The Building:
Each opening shall have a minimum net free area as noted:
Model Square Inches Model Square Inches
206/207
200
336/337
333
266/267
266
406/407
399
B.)
Typical Screened and
Louvered Opening (sq.
010744
009832
010744
010745
010745
009832
009833
009833
The D-2 Power Vent operates with a positve vent static pressure and with a vent
gas temperature that prevents excessive condensate
production in the vent. with capability of rewiring for 120 VAC. however.)
Typical Screened or
Louvered Opening (sq.
VENT PIPING
WARNING: Indoor heaters require a drafthood that must be connected to a vent pipe and properly vented to
the outside.)
266/267
67
101
134
100
150
206/207
50
336/337
75
84
406/407
126
100
168
200
CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage the
heater and void the warranty. All Air From Outdoors:
When air is supplied directly from outside the building.COMBUSTION AND VENTILATION AIR (Indoor Units Only)
The heater must have both combustion and ventilation air. when installed as directed. (Catalog No. avoid long
horizontal runs of vent pipe and too many elbows. Minimum requirements for net free air supply openings are one opening that is 12 inches from the ceiling for ventilation.1(CanadaCAN/CSA-B149) and any local codes that may have jurisdiction.CAN/CSA-B149). and one opening that is 12 inches from the
floor for combustion air as outlined in the latest edition of the National Fuel Gas Code. in. Failure to follow this procedure can cause fire or fatal carbon monoxide poisoning. As much as possible.
A. The unit is factory-wired for 240
VAC. is a CATEGORY III
appliance.
240 VAC
Part No. ANSI Z223. Gas vents supported only by the flashing
and extending above the roof more than five feet should be securely guyed or braced to withstand snow and
wind loads. Another option for
installation that requires horizontal runs is using the D-2 power vent kit option.1). ANSI Z223. when the total vent height is at
least 10 ft (drafthood relief opening to vent terminal). If installation requires horizontal runs.
The power vent assembly is a fan-assisted combustion system designed for application to models 206-407. We recommend use of insulated vent pipe spacers through the roofs and walls. each opening shall have a minimum net free area
as noted:
Model
Unrestricted Opening (sq. in. is capable of operating in applications such as through-the-wall venting and
reduced horizontal and vertical vent pipe sizes in new and current installations. and
as such. in.
criss-crossed.

The vent cap location shall have a minimum clearance of 4 ft horizontally from.45 kPa). FAILURE TO FOLLOW THIS PROCEDURE MAY DAMAGE THE GAS VALVE. WC
for Lo NOx units). A minimum of 12 in.
WC and a maximum of 14 in. WC
upstream pressure under load and no-load conditions
must be provided for natural gas.
Gas piping must have a sediment trap ahead of the
heater gas controls.
VENT CAP
2' MIN
2' MIN
5' MIN
NOTE: Do not use Teflon tape on gas line pipe thread. Vent pipe should be adequately supported to maintain proper clearances from combustible
construction. Use soapy
water for leak test. the
vent pipe must terminate with a vent cap which complies with the local codes or. and in no case below.
GAS SUPPLY CONNECTIONS
The discharge opening must be a minimum of 2 ft vertically from the roof surface and at least 2 ft higher than
any part of the building within 10 ft. All gas piping should be
tested after installation in accordance with local codes.
19
. Support must be provided in
compliance with applicable codes. in the absence of such
codes. DO NOT use open flame.
unless a 4 ft horizontal distance is maintained. to the latest edition of the National Fuel Gas
Code. regulators and relief
equipment.
10' OR LESS
CAUTION: The heater and its manual shut-off valve
must be disconnected from the gas supply during any
pressure testing of that system at test pressures in
excess of 1/2 psi (3.
Type "B" double-wall or equivalent vent pipe is recommended.CAN/CSA-B149). contact the factory. and a maximum of 14 in. OVER PRESSURIZED GAS
VALVES ARE NOT COVERED BY WARRANTY. Vent stack shall be
at least 5 ft in vertical height above the drafthood outlet.1 (Canada . The
heater and its gas connections shall be leak tested
before placing the appliance in operation. gas meters. ANSI Z223. from
electric meters. However single-wall metal vent pipe may be
used as specified in the latest edition of the National
Flue Gas Code ANSI Z223. WC are required for
propane gas under load and no-load conditions.
HEATER
NOTE: With venting application of two or more
heaters. leaving the two end threads bare.CAN/CSAB149). and a manual shut-off valve located outside the heater jacket. Dissipate test pressure
in the gas supply line before reconnecting the heater
and its manual shut off valve to gas supply line. Apply sparingly only
on male pipe ends.
The weight of the vent stack or chimney must not rest
on heater drafthood.1 (Canada .For protection against rain or blockage by snow. The heater top and
drafthood must be readily removable for maintenance
and inspection.
A pipe compound rated for use with natural and
propane gases is recommended. WC for atmospheric units (5 in.
VENT PIPE
SUPPLY PRESSURES
DRAFT HOOD
A minimum of 6 in.

Header
Header Flange
(Supplied)
CPVC Connector
(Supplied)
Plumbing
WARNING: NEVER install PVC directly into header
flanges.
DO NOT use petroleum-based assembly fluids (such
as petroleum jelly or lubricating oil). PVC may be
used immediately after the supplied CPVC adapters.
POLYMER HEADERS (STANDARD MODELS)
Before attaching the 2-inch unions to the inlet/outlet
header.
GASKET DESIGN #1: Accepts 1-1/2" copper tube or
1-1/4" galvanized pipe as a slip connection. Hand tighten the
unions. Use the 2" CPVC adapter supplied loose
with the heater. it is suggested
that a check valve (or valves) also be installed in the
system. This is not the same as the
Schedule 80 PVC pipe which is also gray.
#1
#2
INLET/OUTLET HEADER . Discard unused set. If assembly lube is
22
Gasket
Unitherm
Governor
. Use AquaLube or equivalent non-petroleum-based lubricant on the O-ring.
GASKET DESIGN #2: Accepts 2" copper tube as a
slip connection. Also used with the 2" CPVC
adapters.
U. The flange is threaded for 2" screw in
pipe connections.
Flange Gasket
CAST IRON HEADERS (ASME MODELS)
Heater must be located so that any water leaks will not
damage the structure of adjacent area.G.
Kit # 013969 can be ordered that will allow a standard ASME unit to comply with the code requirements. It is also needed
to inhibit scale formation in the tubes by maintaining
temperatures well below accelerated scaling temperatures. High temperature 2" plastic pipe (CPVC) may be threaded directly
into the header flanges. Plug
(Polymer)
NOTE: Some jurisdictions require the addition of a
flow switch and T&P gauge on ASME installations. Use the appropriate gaskets for all your
heater connections. use a silicon base such as AquaLube etc. This narrow range is needed to prevent damaging condensation on the burners which will occur if the heater runs
for any length of time below 100°F. Glue PVC piping directly to the unions. make sure the O-rings are properly seated in
the grooves.required.ASME
High-temperature CPVC header flanges and header
flange nuts are provided. If there is any possibility of
back-siphoning when the pump stops.POLYMER
O-Ring
Header Flange
(CPVC)
Header Flange Nut
(CPVC)
There are two sets of flange gaskets supplied with
your heater.
Header Flange
UNITHERM GOVERNOR OPERATION
CAUTION:
The patented Unitherm Governor is a thermostatic
mixing valve specifically designed to maintain constant heater internal temperature between 105° and
115°F despite continually changing flow rates from
the filter and changing pool temperatures.
INLET/OUTLET HEADER .

Valve lever should be tripped at least once a year to
ensure that waterways are clear. a built-in automatic bypass valve is provided in the in/out header. Drain pipe
must be the same size as the valve discharge connection throughout its entire length and must pitch downward from the valve. particularly
when starting the heater in winter or early spring when
the spa or pool temperature is below 50°F. The maximum acceptable pressure relief
valve setting is 125 psi.
Bypass Disc
Spring
POLYMER HEADER
(STANDARD MODELS)
Bypass Body
Pressure Relief Valve
EXTERNAL AUXILIARY BYPASS VALVE
(Where Required)
An auxiliary bypass valve should be used when flow
rates exceed 125 GPM. is recommended for
this heater. The
valve shall be installed in a vertical position. if cold.
In addition to the Unitherm Governor.
open bypass.
AUXILIARY BYPASS VALVE ADJUSTMENT
To set bypass: With clean filter. No shut-off valve shall be
installed between the relief valve and the drain line. Proper amount of water flow
is maintained through the heater under varying pressures dictated by the conditions of the pump and filter. This valve is required to complement the
function of the automatic bypass valve. It also
serves to eliminate needless pressure drop through
the heater and accompanying reduction in the flow rate
to the spa jets. the internal bypass
valve automatically responds to changes in water pressure in the piping system. Outlet
pipes should be slightly warmer than inlet and comfortable to the touch. Do not
overtighten. having a capacity equal to the BTUH output of the model to be installed.
CAST IRON HEADER
(ASME MODELS)
To Heater
From Pool/
Spa
AUXILIARY BYPASS VALVE
(DO NOT USE GATE VALVE)
PRV
NOTE: To avoid water damage or scalding due to
valve operation.
PRV Discharge
Connection
23
.
From Heater
To Pool/
Spa
In/Out Header
Fig.PRESSURE RELIEF VALVE INSTALLATION
INTERNAL AUTOMATIC BYPASS VALVE
To conform to local building codes.
A 3/4" NPT connection is provided in the Polymer
header for installation of a pressure relief valve. A 3/4" pressure
relief valve. adjustment is made by
feeling the inlet and outlet pipes at the heater. it may be necessary to install a pressure relief valve. Usually a high-performance
pump size larger than two horsepower will exceed this
flow rate. Install pressure relief valve hand tight
plus 1/2 turn. close bypass. If pipe is hot. etc. drain pipe must be connected to valve
outlet and run to a safe place of discharge. #2004
A 3/4" NPT connection is provided in the header for
installation of a pressure relief valve.
While the Unitherm Governor responds to the changes
in water temperature in the heater. The valve shall
be installed in a vertical position.

Heater must be located so that any water leaks will not damage the structure of adjacent area. and
3. The inlet side of the filter is plumbed directly to the discharge side of the filter pump. If the primary system provides
adequate heat to maintain set-point.
2. A typical installation is plumbed as follows:
1.PLUMBING—WATER CONNECTIONS
Single Pool Heater
Installation
Multiple Pool Heater
Installation
The heater requires water flow and positive pressure to fire and operate properly. The outlet side of the filter is then plumbed to the inlet of the heater. e. must be connected to the main line
ahead of the heater inlet pipe in order for it to act as the primary heat source.g.
Plumbing from the heater back to the pool or spa must not have any valves or restriction that could prevent flow
when the pump is operating. PVC pipe may
be glued directly into header unions (Standard models only). the heater will not fire. The pump. filter and heater are thus
plumbed in series (Salt generators and chemical feeders must be down stream of the pool heater). rather than the temperature of the
water exiting the pool. The outlet of the heater is plumbed to the return line to the pool or spa.
24
.
CAUTION: An additional source of heated water. It must therefore be installed
downstream of the discharge side of the filter pump. a solar system. Be advised that the control panel will then display
sensed water temperatures downstream of the primary heating system.

AFT Models: Insert the temperature sensor into
the compression fitting. and pressure switch on the in/out
header (Figure 2). Re-attach access panels to the opposite sides.
2. AFT Models: Remove the thermostat temperature
sensor by loosening the compression fitting nut
(Figure 3). #4
25
. Millivolt Models: Insert sensor bulb and retainer
clip into sensor well. #3
Fig.STANDARD MODELS
1. Re-route the sensor to the left side of
the heater. #5
Fig.
Fig. and pressure switch
wires. #1
Fig.
3. AGS. Tighten 1/2 turn past
hand-tight. Re-attach the headers to the opposite
sides. Also clean off
the header and the gasket. Torque
should not exceed 7 ft/lb. Millivolt Models: Remove the temperature sensor bulb and retainer clip from the sensor well
(Figure 4). so that the sensor is flush
with the top of the fitting. #2
For ASME Models call your factory representative. Clean off tube
sheet area where the gasket seats.
Fig. Re-route the sensor bulb to the left side
of the heater.
4.
5. making sure they are installed in an upright
position (Figure 5). Do not over tighten.
10.
6. Apply a non-petroleum-based lubricant to the gasket such as
AquaLube. Reconnect high limit.
7. AGS (automatic gas
shut-off).
8. Allow for water flow through the heater and check
for leaks.
9. Disconnect wires at high limit.HEAT EXCHANGER REVERSAL PROCEDURE . Remove right and left side access panels
(Figure 1). Remove (12) bolts holding the inlet/outlet and
return headers to the tube sheets.

SWAY
BRACE
BONDING
LUG
(OPTIONAL
LOCATION)
BONDING
LUG
(STANDARD
LOCATION)
ATMOSPHERIC
Wiring locations
OPTION LOCATION
LEFT SIDE FIELD WIRING
NOTE: 7/8" dia.
5.
9.
When installing a remote switch. Use 18-gauge stranded wire.
CONTROL BOX
(FACTORY MOUNTED
LOCATION)
SWAY BRACE
BONDING LUG
(OPTIONAL
LOCATION)
26
BONDING LUG
(STANDARD
LOCATION)
LO NOx
Wiring locations
. DO NOT attempt to operate at 208 VAC. Remove the four (4) screws that hold down the
junction box to the sway brace.
6. Remove transformer from its current location and
relocate it on the far left side of the heater. junction box.
Mounting hole is provided on the jacket.
7. No external electrical
connections are required. and/or 150°C
wire or its equivalent. Remove the one (1) screw that holds down the
ground wires.
8.
MILLIVOLT MODELS
The Millivolt models are equipped with a self-generating electrical system in which the electrical current is
provided by a pilot generator. Remove the two (2) screws that hold down the
transformer. like the original wiring. use 105°C wire or its equivalent. Remove the transformer cover located on the far
right by removing one (1) screw. Install bonding lug on lower right or left side
of jacket as necessary for bonding the heater. follow these
steps :
1. Disconnect P6 connector from PC board.
4.ELECTRICAL WIRING
CAUTION: Heater must be electrically grounded and
bonded. do not exceed 10 ft of
wiring from the heater. Remove and set aside door for better access to wiring. and plug right
side with the left side’s grommet plug.
transformer.
NOTE: If it is necessary to replace any of the original
wiring. auxiliary control
interface or power vent (D-2) wiring.
3. ground wires (SPG).
NOTE: Failure to ground the heater electrically
could affect the heater’s electronics.
2. Bonding lug is provided loose with the
heater.
NOTE: See page 38 for further instructions if using
a time clock/fireman’s switch.
The Electronic Intermittent Ignition Device automatically lights the pilot and main burners upon a call for
heat.
CONTROL BOX
(FACTORY MOUNTED
LOCATION)
The standard field-wiring connection is on the right
side of the heater. front door. Re-install P6 connector. Re-route all high-voltage wires and ground wires
through the left jacket side of heater. holes not utilized on jacket and control
box can be used for fireman switch.
To wire the heater from the left side. The heater is supplied with a dual-voltage transformer for 120 VAC or 240 VAC input power hookup. Remove the two (2) screws that hold the front door
to the heater.
ADVANCED FLAME TECHNOLOGY (AFT)
MODELS
WARNING:
OPTION LOCATION
LEFT SIDE FIELD WIRING
Heaters are factory-wired for 240 VAC power supply.

Such damages are not covered under manufacturer’s limited warranty. the heater could display false
service indicators on the display panel if the pump is turned off. (Canada . and that the heater be controlled by the fireman’s switch connection or using a two
or three-wire remote. with the latest edition of the National Electrical Code.TRANSFORMER WIRING
120 VAC WIRING
For 120 VAC input power to the unit. ANSI/NFPA 70.
240V ATMOSPHERIC HEATER
SUPPLY
SIDE
L1
L2
HOT
BLACK
HOT
L1
BLACK
RED
RED
GREEN
GREEN
240V LOW NOx HEATER
SUPPLY
SIDE
HEATER
4 WIRES
L2
GROUND
WHITE
HOT
BLACK
HOT
RED
GREEN
BLACK
BLACK
RED
RED
GREEN
HEATER
7 WIRES
WHITE
WHITE
Heater must be electrically grounded and bonded in accordance with local codes.
NOTE: Input power to the heater (120 or 240 VAC) can be supplied from the load (pump) side of time clock or
directly from the GFCI power source. For Lo NOx pool heaters attach a wire nut to
each white wire independently.
27
. There should
be no connection to the white wire for 240 VAC operation.Canadian Electrical
Code.1. Connect
the white wire to the “Ret” or neutral leg of the power supply. connect the black wire to the “L1” or hot leg of the power supply. in the absence of local
codes.)
NOTE: If the transformer’s primary side is wired for 120 VAC and 240 VAC is applied. Connect
the red wire to the “L2” or second hot leg of the power supply. Attach the wire nut to the red wire. There should
be no connection to the red wire for 120 VAC operation. Attach the wire nut to the white wire. Part 1 and Part 2. If using a switched GFCI power source. For Lo NOx pool heaters attach a wire nut to each
red wire independently.
WARNING: DO NOT attempt to operate the heater at 208 VAC. CSA C22.
120V ATMOSPHERIC HEATER
SUPPLY
SIDE
L1
RETURN
or
NEUTRAL
GROUND
HOT
BLACK
BLACK
WHITE
WHITE
GREEN
GREEN
120V LOW NOx HEATER
L1
SUPPLY
SIDE
HEATER
4 WIRES
RETURN
or
NEUTRAL
HOT
BLACK
BLACK
BLACK
WHITE
WHITE
WHITE
GREEN
GREEN
RED
HEATER
7 WIRES
RED
RED
240 VAC WIRING
For 240 VAC input power to the unit. See pages 36-38. It is preferred that full-time power be supplied to the heater from the
GFCI power source. damage to the transformer and PC board may result. connect the black wire to the “L1” or hot leg of the power supply. or.

KNURLED
SCREW
SPA TEMPERATURE
RANGE
POOL TEMPERATURE
RANGE
2.
1.CONTROL PANEL REMOVAL
CONTROL ADJUSTMENTS .
The thermostat is fitted with a means of limiting the
upper temperature limit below the maximum level.
NOTE: Caution must be used to not damage controls
or wiring. The
control center contains an On/Off switch and one thermostat.
3. Set aside door for
serviceability. Remove (4) screws from sides of control panel.
The knob stop adjustment ring illustrated below is
adjustable by loosening the set screw. Remove screw from front door.
CONTROL ADJUSTMENTS ADVANCED FLAME TECHNOLOGY
(AFT) MODELS
KNOB STOP RING
SET SCREW
STAND-BY
TEMPERATURE
KNOB STOP SHOWN ABOVE IS
IN THE SPA TEMPERATURE RANGE
Temp Adjust Buttons
Mode Button
ON
OFF
LCD Display
32
. rotating the
knob stop ring to the desired location and re-tightening
the set screw. Do
not force. Rotate control panel down until panel stops.MILLIVOLT MODELS
The water temperature is controlled by the heater thermostat on the upper front panel of the heater.

the pilot flame current using a bar graph and numerical display. The Run Time indicates the
total hours of operation for the pool heater. A manual power switch provided below the
touchpad turns the control power ON or OFF.” When the water temperature is below
the setpoint and the heater is firing. If there are no faults in the
history buffer. Refer to Section
5 – Troubleshooting for possible causes and corrections. and to adjust the setpoint
temperature.
SUPPLY VOLTAGE INDICATOR
Press the DOWN button. The LCD display window indicates the
mode (OFF. allows the user to select either
POOL or SPA operation. which indicates
FAULT HISTORY
33
.” which is the most recent fault. The order of the faults
begins with “Fault Last. the actual water temperature is displayed along with the desired water temperature (SETPOINT). the desired
water temperature (SETPOINT) will also be displayed
and may be adjusted using the UP or DOWN buttons. the second line reads “All Faults Clear.”
To adjust the setpoint temperature. It also allows the user to turn the
heater off electronically. The heater will continue to operate normally while in the Service Menu. The Cycle count indicates the number
of on/off cycles of the heater. “Water Temp” will alternate with
“No Demand. The first screen displayed is the Flame Strength indicator.
Operation
In the POOL or SPA modes. The Supply Voltage screen
indicates the voltage supplied to the control board.”
ALTERNATING DISPLAYS DURING HEATING
Service Menu and Fault History
To access the Service Menu and fault history. as measured by the
number of times the pilot valve has been powered. press
the MODE and UP buttons simultaneously for 3 to 5
seconds. The second line of the display
shows the fault message. make sure the control is in the appropriate mode (POOL or SPA) and
push the UP or DOWN buttons. When the water temperature is
above the setpoint.
RUN TIME INDICATOR
Press the DOWN button. as measured by the amount of time that the main gas valve has
been powered.
Temp Buttons
If the heater is in POOL or SPA mode.
and proceeds through ten most recent messages in
chronological order.THERMOSTAT OPERATION .
FLAME STRENGTH INDICATOR
Press the DOWN button.ADVANCED FLAME TECHNOLOGY (AFT) BOARD
LCD Display
Temp Buttons
Program
button
Mode Button
The pool heater touchpad. POOL) and the actual water temperature.
Mode Button
The MODE button is used to select either POOL or
SPA operation. “Water Temp” will
alternate with “Heating. located on the upper front
panel of the heater. The Fault History can display up to ten faults in memory. allowing the LCD display to
remain energized and to continue showing the actual
water temperature. SPA. A signal of less than 4 indicates a weak
flame signal and may require service.
Normal readings range from 24 to 29 volts.

Choose the desired temperature scale. This operation resets the Fault
History file to “0” and clears all the stored faults. Press the Mode button until Fahrenheit or
Celsius appears on the digital display. Note that power cycling will not clear the
lockout. Confirm your selection and record your
PIN. press the
DOWN button and Mode button for 5 seconds.
SPA setpoint maximum adjustment.
These setpoints will need to be readjusted to desired
settings. Press the Mode button until Pool Max Temp
appears on the digital display.
34
. Press and hold both UP
and DOWN buttons for 5-7 seconds until Faults
Cleared appears. press any button to bring up the
Enter PIN menu.5°C) and the POOL and SPA maximum temperature settings will be 104°F (40.5°C) and both POOL and SPA maximum
temperature settings will be 104°F (40.
Set Factory Defaults
Refer to step one above to access the program
screen. Press the Mode button until Spa Max Temp
appears on the digital display.
Resets faults in the History File. This will clear the PIN and
allow normal operation and selection of a new PIN if
desired. Using the UP and
DOWN buttons will change the Maximum Temperature
Setting to your desired value. The control can be set
for a maximum of 107°F. The control can be set
for a maximum of 107°F. using the UP and DOWN
buttons to select the digits and the Mode button to lock
in selections.
NOTE: Both the POOL and SPA setpoints will revert
back to 65°F (18.
Spa Max Temp – Spa Set Point Maximum
Adjustment
Refer to step one above to access the program
screen. There are 5 different events that can be programmed.
Program Button
1) Remove the four screws holding the control cover. The digital display is capable of displaying Celsius as well as
Fahrenheit temperatures. Using the UP and
DOWN buttons will change the Maximum Temperature
Setting to your desired value. If it does not. Successfully unlocking the control will display
“Lockout Cleared.
Control Lockout
The heater is equipped with a Control Lockout feature
to prevent unauthorized tampering or adjustment of
the control settings. Press the Mode button until Clear Faults
appears on the digital display.” Failure to enter the correct PIN will
display “Invalid PIN. The UP or DOWN buttons
will select Fahrenheit or Celsius on the temperature
display.
Press and hold both UP and DOWN buttons for 5-7
seconds until Defaults Set appears.
2) Press the Mode button sequentially until the
desired program event is reached. Set Factory Defaults should appear on the
screen. Enter the PIN that was used to lock
the control.”
In the event that the user-selected PIN is lost or does
not clear the Control Lockout.
Choose a three digit PIN.
Pool Max Temp – Pool Set Point Maximum
Adjustment
Refer to step one above access into the program
screen. They
appear in the sequence listed below:
Resets board to factory default
settings.
Change from Fahrenheit to
Celsius. Locate the Program
Mode button (marked as SW1) as shown on page
33.
Clear Faults
Refer to step one above to access the program
screen.
Release the program button. Press and hold the button (5-7 seconds) until
Set Factory Defaults appears on the display.
POOL setpoint maximum
adjustment.
and swing the panel down so the back side of the
board is visible (see page 31). The
Control Lockout PIN will be cleared and the control will
resume normal operation. See the Program Button directions on this
page for details.Fahrenheit or Celsius
Refer to step one above to access the program
screen. use the Program Button
to Set Factory Defaults. Both the POOL and SPA setpoints will revert to
65°F (18.0°C). This operation
resets the operating program to its factory default values. press the Mode button until Set
Factory Defaults appears on the digital display.
To unlock the controls.0°C). To lock out the controls.

replace board.
Not Broken)
Internal Fault Board fault.
(Above 217°F)
Sensor Open
Flame w/o
CFH
PV Output
Fault
MV Output
Fault
Thermistor sensor failed open.
Display
Condition
Heating
Call for heat established.
Hi Limit 2
Fault
Fan Lockout
Board is sensing flame when both
main and pilot valves are commanded shut.
Time clock/fireman switch circuit is
open.Pilot flame not estabIgnition
lished within the required time (15
Lockout
sec or 90 sec).
High limit 1 open.
replace board if fault does not clear.
Flow/Field
SW #2
Field-supplied flow switch/field
switch #2 open. The heater reads the water temperature at the inlet. Spa
and Remote modes.
Display
Water Sw
Open
Spark operating
Display
Sensor
Failure
Thermistor temperatures disagree
by more than 2°F
Sensor Short
Thermistor sensor failed short.
STATUS AND DIAGNOSTICS
The digital thermostat models are programmed to display a variety of status and diagnostic messages.
The following heat status messages are displayed in
Pool.
Clock/
Fireman Sw
High limit 2 open.
Rollout Sw
Open
Condition
Water pressure switch open. Heater will lockout for
Not Broken)
6 minutes before retrying.
Vent/Field
Sw #1
Hi Limit 1
Fault
The following conditions are displayed in Pool.
LoNox Tab
Fault
Vent spill switch/field switch #1
open.
35
. power must be
cycled to clear the fault.
Ignition
Alternating with “No pilot
Failure
sensed” .
(Propane Tab Alternating with “Main Ign
Broken)
Failure” .
Fan 5 Min
Delay
Heater shut down for 5 minutes
because LoNox fan switch didn't
close. the water temperature at the inlet to the heater may differ from that observed at a given location in the
pool or spa.
3 fan switch faults within same heat
demand cycle.Pilot flame lost during the
8 second trial to ignite the main
burner.
Low Temp
Lockout
Rollout switch open.
Condition
Alternating with “Main Ign
Ign 6min
Failure” . Spa. reset set points.
EEPROM
Fault
Memory fault. flame
present
No Demand
Heat demand is satisfied
Spark
The following conditions are displayed only while there
is a demand for heat present.NOTE: The LCD temperature display may not agree with the temperature reading of your pool or spa thermometer. Due to the circulation characteristics of any pool
or spa.
(Below -20°F)
Main gas valve output is not in commanded state.Pilot flame not estab(Propane Tab
lished within 90 seconds.
Alternating with “No pilot
sensed” . depending on the operating conditions.
Water temperature below 36°F.
Voltage is sensed at the Lo NOx terminal on a non-Lo NOx heater (Lo
NOx tab is intact).
Pilot gas valve output is not in commanded state.Pilot flame lost 4 times
Delay
within the 8 second trial to ignite the
(Propane Tab
main burner. and Remote modes when there are no
active fault conditions.

When connecting the heater to a remote system. The remote works by either making or
breaking the circuit created by the remote wiring.
NOTE: When in remote operation. following ESD
preventive/removal practices. This damage can be
limited if the service person discharges himself. and service codes (See examples below). follow
these steps:
Spa Common
(ORN/BLK)
7-PIN Remote
Interface Harness
Remote Mode
Press and hold the UP and DOWN arrow buttons for
3 to 5 seconds.
For operation of the heater using the onboard thermostatic controls with a time clock.
Typically.
OFF Mode
Heating in the POOL Mode
Heating in the SPA Mode
Pool Common
(BLK/ORN)
ACTIVATING THE REMOTE
To activate or deactivate the remote function. When
one walks to the heater area.
Note: Electrostatic Discharge (ESD) damage can be caused by
direct or indirect contact with the wiring or circuit board. and holds on to the heater enclosure for 5 seconds before proceeding. Select the appropriate instruction listed below to properly install the remote to the heater.
The second line of the display will alternate even
when the unit is off (“No Demand”). a remote does not supply power to the
heater.
36
. an electrostatic charge accumulates on the body. The touch pad on the control panel allows you to select the desired pool or spa temperature. Contact of a finger allows the body to discharge. see the “Time Clock /
Fireman’s Switch” section. It also indicates when a remote system is
controlling the heater by displaying Remote in the display. read the following:
The digital thermostat model is remote-ready in most cases. it will not work with this
heater and may damage the digital circuit board. The digital liquid crystal display (LCD) shows the
actual pool temperature.
identify whether it is a two. If your remote is supplying its own
voltage to the heater. operating status. possibly causing device damage.REMOTE CONTROL INSTALLATION AND OPERATION
CAUTION: Before installing remote controls to the AFT thermostat model heaters. The supplied 7pin remote wiring connector supplies power out to
either a toggle switch or the switch contacts of a third
party remote.or three-wire remote system. it only provides a switching function to turn the
heater On or Off.
24VAC HOT
(BLU)
REMOTE OPERATION
The AFT model heaters are equipped with the ability
to work with external remote controls. the keypad
mode and temp buttons are disabled.

•
For runs of under 30 feet. Attach wire nut on unused wire to the "Remote Interface Harness.
2-Wire Remote Control (On-Off)
This application assumes that only one heating function (pool or spa) is required.
•
For both two. 600V.
3-Wire Remote Control Using Three-Position Switch (Pool-Off-Spa. see page 36.
To activate the remote control.To Spa (COMM)
ORN/BLK .
5.
•
Remote wiring must not be run parallel to high voltage lines. For a 2-Wire Remote Control from a remote with its own sensor.5 inch
lay that is shielded and jacketed.
2. the provided 7-pin wiring connector must be utilized. The actual setpoint will be controlled by the remote control.
•
Maximum cable length is 200 feet.To Spa (COMM)
AFT Board
BLU .
4. 102 °F for Spa).
1. connect the BLUE wire to one side of the "REMOTE" switch and connect the other side to either the ORANGE/BLACK wire for "SPA" operation or the BLACK/ORANGE wire for
"POOL" operation.
•
For runs over 30 feet. 80°F for
Pool and 102°F for Spa). Turn the mode button to "OFF" and remove power from the heater.To Pool (COMM)
ORN/BLK .
P8 Connector
P8 Connector
Wire Nut . see page 36. Please
refer to the wiring instructions.
5. For a 2-Wire Remote Control from a remote without its own sensor. lay and jacketed."
7. push the mode button to the “POOL” or
“SPA” mode and set the desired setpoint (eg. Push the mode button to the "POOL" or "SPA" mode and set the desired temperature for each (eg.
3.
6. On the "Remote Interface Harness" connect the BLUE wire to one side of the "REMOTE" switch and connect the ORANGE/BLACK wire for "SPA" operation and the BLACK/ORANGE wire for the "POOL" operation.and three-wire remote systems. Turn on power to the heater.BLK/ORN
To Pool (COMM)
BLK/ORN .
2. push the mode button “POOL” or “SPA”
mode and set the temperature to the highest setting available on the control.
cable twisting 1.REMOTE CONTROL WIRING
Important Installation Notes for Remote or External Wiring Configuration
•
Remote wiring must be run in a separate conduit.5 in.
1. 600V. Turn the mode button to "OFF" and remove power from the heater.
4. Install the "7-Pin Remote Interface Harness" to the P8 connector and turn power “On” to the heater.
NOTE: The remote wires must be connected to the 7-pin connector
before the connector is plugged into the board. cable twisting 1.5 to 2.5 to 2.
To activate the remote control. or Low-Off-High)
This application assumes that both heating functions (pool and spa) are required. On the "Remote Interface Harness". remote wiring should have stranded conductors with a minimum of 22 AWG.
3. Install the "Remote Interface Harness" to the P8 connector and turn power "ON" to the heater. Turn on power to the heater.24VAC
2-Wire Remote Control
37
3-Wire Remote Control
AFT Board
. the conductors should be a minimum of 20 AWG.24VAC
BLU .

it may be
necessary to adjust the pressure switch to compensate for the no-flow static head. the pump must be run at high speed
when heating the water. Manually turn the pressure adjustment knob clockwise until the heater shuts off.
. The fireman’s switch connection on both millivolt and AFT heaters must be
a dry contact and must not supply power to the
heater.
AFT heaters: Do not exceed 50ft of total wiring using
18 AWG stranded copper wire rated for 105ºC (221ºF)
minimum.
TIME CLOCK/FIREMAN’S SWITCH
To operate the heater with a time clock. Turn an additional 1/2 turn counter-clockwise. Splice into the red wire jumper tagged
“Where necessary add “Fireman’s” switch circuit here”
to connect the time clock. Slowly turn the adjustment knob counter-clockwise
until the heater calls for heat again. Set the heater control to the
OFF mode. caused by excessive
restriction in the heat exchanger flue passage. the flow on the low-speed is insufficient
to operate the heater.
7.
3. (A flat screwdriver
may be necessary if knob is too tight. either the switch setting is too high or not enough pressure is being
supplied by the filter pump. When the heater
is located below the level of the spa or pool. It is
located on the inlet/outlet header.
For AFT heaters the fireman’s switch connection is
located on the 14-pin header connected to the digital
control board.75 PSI for deck-level installations.)
6.4.
PRESSURE SWITCH
ADJUSTMENT RANGE
5 FT.
5 FT.
5. Make sure the pool filter is
clean before adjusting the
switch. This is a
"single-use" type fusible link or
thermal fuse.
MAX
POOL OR SPA
NOTE: If heater is installed outside of the limits
shown. connect the
timer to the fireman’s switch connection in the heater’s
wiring. If the
pressure switch fails to close. A flow switch. If it does not. Both are set
to open at 135°F. mounted and wired adjacent to the
heater. utilize the following
procedure:
CAUTION: Do not operate the heater without the
function of a properly adjusted water pressure switch
or flow switch.
FLAME ROLL-OUT SAFETY SWITCH
Atmospheric heaters are
equipped with a thermal cutoff
device to prevent flame roll-out
in the event the heat exchanger becomes blocked.
MAY REQUIRE ADJUSTMENT
FOR LOWER PRESSURE
38
HIGH LIMITS
The heater is equipped with two automatic high limits. If it is necessary to
adjust the water pressure switch.
WATER PRESSURE SWITCH ADJUSTMENT
1.
TWO-SPEED PUMPS
In some cases. a higher pressure rated (11 psi) switch may be
used. See Parts List (page 52) for 11 psi
water pressure switch.
8. repeat the above
steps until proper operation is observed.
In these cases. may be used in place of the factory-mounted
pressure switch. It is factory set at
1. that must be
replaced when disabled by an
over-temperature condition. indicating that the time clock has shut off the
call for heat. Turn the filter pump on and
Adjustment
Knob
confirm that the pressure
switch is closed (use a multimeter to check). the heater will display “Clock/ Fireman Sw” when the fireman’s switch
is open. and is not covered by warranty.
WATER PRESSURE SWITCH
The water pressure switch ensures that the heater
operates only when the filter pump is in operation.
NOTE: When using a time clock. check the adjustment
by turning the pump off and on several times.
Both are located in the inlet/outlet header.
MAX
MAY REQUIRE ADJUSTMENT
FOR HIGHER PRESSURE
Millivolt heaters: Do not exceed 15ft of total wiring
using 14 AWG stranded copper wire rated for 105ºC
(221ºF) minimum. Turn the heater ON. The
burners should shut off immediately when the
pump is turned off. On millivolt heaters the fireman’s switch connection is a wire nut located in the Violet/Black wiring
between the manual toggle switch and the gas valve. The time clock should be of the dual switch
type and set to shut off the call for heat to the pool
heater 15 to 20 minutes prior to shutting down the pool
pump. Powering the fireman’s switch connection
externally may damage the heater. While the heater is running.
2. This is apparent when the water
pressure switch cannot be further adjusted or if the
heater makes banging noises or shuts off on high limit.

GAS VALVE
BURNER
PILOT
GAS
ORIFICE
BURNER
HOLD-DOWN
BRACKET
PILOT SAFETY .
5. Disconnect hi-tension wire from PC board. Lift burners from slotted spacers and slide from orifices.
HIGH LIMIT REMOVAL
NOTE: If the heat exchanger is sooted badly.
3. DO NOT overtighten when reinstalling. pilot tubing and bleed line.AFT Models
The heater employs a pilot safety which closes the
main gas valve within 8/10ths of a second whenever
the pilot flame is interrupted. Remove screws and burner hold-down bracket. Shut off main electrical
power switch to heater.g.
defective bypass. To remove
orifice. Reverse above procedure to reinstall.
3.
HONEYWELL MILLIVOLT
PILOT
GAS VALVE REMOVAL ATMOSPHERIC MODELS
1.
and (2) screws that secure gas valve to jacket. use a socket wrench and remove from
manifold. Shut off gas supply to the heater.
MAIN BURNER AND ORIFICE REMOVAL ATMOSPHERIC MODELS
1.
2. and clean with wire or small brush.
PILOT SAFETY . Remove gas
piping to gas valve inlet. To
clean. The pilot flame is automatically lit when the device is powered. Reverse above procedure to reinstall. Orifices usually do not need to be replaced. Remove pilot from bracket. Disconnect wires that terminate at gas valve.
8.
6. Disconnect gas line from gas valve.
2. the
burner hold-down bracket and spacer can become distorted from direct-flame impingement and this usually
necessitates replacement of these parts.
4.
4. Remove pilot assembly from burner tray. Remove inlet/outlet
inspection panel.
4. Disconnect pilot tubing and wires from gas valve. Shut off main electrical power switch to heater.
1. Turn vertical gas pipe from manifold slightly and
unscrew gas valve.
3. e. The pilot burner must be manually re-lighted
to place the heater in operation again.
4.
2. Disconnect wires.
BURNER TRAY REMOVAL ATMOSPHERIC MODELS
1.
2. scale build-up. if
required. Shut off gas upstream of heater.
206-406
Atmospheric
PILOT REMOVAL AND CLEANING
1.
5.
9.
3. Slide out burner tray. Do not enlarge hole. The heater
performs its own safety check and opens the main
valve only after the pilot is proven to be lit. Remove front door.
2. Refer to the
lighting instructions provided on the heater label. Remove burner tray.NOTE: An erratic high limit is often characteristic of an
internal heat exchanger problem.
7.
CAUTION! Do not enlarge hole in pilot orifice. Remove (2) screws that mount burner tray to unit. Reverse above procedure to reinstall. Remove pilot orifice and air opening (Honeywell
MV unit only). Clean with a wire brush. Remove defective high
limit and replace with a
new high limit. Remove burner tray from heater.
4.
3.
5. Refer to Troubleshooting section
(starting on page 43). Replace inspection panel. run either copper wire or wood toothpick
through orifice.Millivolt Models
Heaters equipped with the standing pilot (millivolt system) have pilot generators which act as a safety
device to shut off the flow of gas to the main burners
and the pilot burner in case the pilot flame is extinguished.
Pilot
ROBERTSHAW MILLIVOLT
PILOT
Pilot
Air
Opening
Orifice
39
Orifice
.

Shut off water to heater and drain heat exchanger.
1.
6.
5.TOP VIEW
Establish a regular inspection schedule.
IMMERSION WELL REPLACEMENT
(Millivolt and ASME)
1.
Atmospheric Heaters
TUBE CLEANING PROCEDURE
Lo NOx Heaters
REFRACTORY PANELS .Extension Pieces (2)
HEAT EXCHANGER REMOVAL
1. Lift heat exchanger straight up using caution not to
damage refractory. then remove relief valve. Remove the flue collector. Remove "V" baffles from heat exchanger.
8.
4. Install replacement well in header. Any sign of soot at the base of the burners or around the outer jacket indicates a need for
cleaning.
7. Remove burner tray. DO NOT WIRE
BRUSH. Shut water.
After reaming. without breaking pipe connections. Disconnect flange nuts on Inlet/Outlet header. Also remove the screws that mount the
rain shield to the sway brace.
Clean out deposits over 1/16" in thickness.
NOTE: In extreme cases it may be necessary to do
steam cleaning at the local car wash.
3. It is preferable.
NOTE: Installation in polymer header should be hand
tight plus 1/2 turn. Remove top and flue collector from cabinet. Remove the four (4) screws holding down the flue
collector. Remove top jacket holding screws.
4. generally. Do not let the tubes clog up solidly.
loosen union(s) at gas pipe and slide heater away
from piping. Remove rear top panel.
COMBUSTION CHAMBER REMOVAL
To remove combustion chamber.
2.
5. the frequency
depending on the local water conditions and the severity of service.
Another method is to remove the heat exchanger. Remove screws mounting the rain shield to the
rear panel. making sure soot is removed
from spaces between fins.
40
. Remove rain shield. gas and electricity off.
Remove side inspection panels. EXERCISE
EXTREME CARE. Remove heat exchanger from the heater and wash
with a garden hose. you must first have
removed the heat exchanger.
Soot will clog areas between fins and cause eventual
tube failure. however. mount the wire brush in place of the
auger and clean out debris remaining in the tubes. close valves
and relieve pressure. Remove old immersion well with bushing and
sleeve.
The heater may be cleaned from the return header
side.
2. Make sure
the insulation strips are properly replaced on top of
the refractory retainer. Remove access panel on water connection side.
2.
3.
Well Assembly
DESOOTING PROCEDURE
WARNING: SOOT IS COMBUSTIBLE.
Auger with Carbide Tip
Wire Brush
4.
Note that you do not remove the top panel or the
heater exchanger. Reverse above procedure to reinstall. to remove both headers for better visibility through the tubes and to be sure the ground-up
lime dust does not get into the system. (See page 39). Reverse above procedure to reinstall.
3.
ream tubes and immerse heat exchanger in non-inhibited de-scale solvent for severe scale build-up.

The baffle has a hole that is utilized to control the air inlet to the blower. close valves
and relieve pressure. taking care to lubricate
gasket with a non-petroleum based grease such
as AquaLube. consisting of an
electronic spark module. gas valve and pilot system. and
the blower will begin running.G.7 Standard for GasFired Pool Heaters.
BLOWER ADJUSTMENT
This Lo NOx pool heater is equipped with a combustion air plate (baffle) mounted on the air intake to the
combustion air blower. System should start as follows:
a. gas and electricity off. Spark will turn on.
OPERATION
On call for heat.
The heater should be installed to meet all local codes. When the operating control is satisfied the heater will shut down. Flame color is blue and evenly spread on
the top surface of the burner.
Retainer Plug
Spring
U.1 and the National Electrical Code. the flames should settle down and
blue tips should become visible.56/CSA 4. Set controller to call for heat. replace unit. Lifting of flames
beyond five minutes would indicate too much combustion air. At least every three
months a visual inspection should be made of the
burners.
b.
3. It is a "manual reset"
type roll-out switch that must be reset by a service
technician after any over-temperature conditions have
been fixed.
c.
Gasket
To test the operation of the Unitherm Governor.) REPLACEMENT
1.
NOTE: Door must be in place for proper operation. pilot gas valve will open. Turn on gas supply. Heater will operate until call for heat is satisfied.G. Providing the pilot is proven. place
in hot water (over 110°F) and watch for movement
against spring. the main gas valve will open and the
heater will operate. Remove retainer plug located next to the outlet
pipe connection. wire size
and connections which comply with all applicable
codes.
FLAME ROLL-OUT SAFETY SWITCH
Lo NOx heaters are equipped with a thermal cut-off
device to prevent flame roll-out in the event the heat
exchanger becomes blocked.UNITHERM GOVERNOR (U.
Snap in new U.
START-UP PROCEDURES
1.
3. the ignition system. ANSI/NFPA
70. Unsnap old U.
deck under cold-start conditions. there will be
some lifting of the flames on some areas of the burner
41
Manual Reset Switch
. Drain heat exchanger.
4.
VISUAL INSPECTION
Flames can be observed through the opening below
the plenum. Turn on power to the heater with gas supply off.
5.
4. the main
gas valve will open. Once the blower provides pressure. to remove from retainer plug. Shut water. Reinstall retainer plug.
2.
LO NOx POOL HEATERS
The Lo NOx pool heaters are certified and tested
under the ANSI Z21.
and the latest editions of the National Fuel Gas Code
Z223. After about five minutes of operation.G. If there is no movement.
ELECTRICAL
Be sure that electrical service to the heater has proper overload fuse or circuit breaker protection.G. is
energized.
2. Excessive restriction in the heat exchanger flue passage may cause the switch to disable the
heater.
When the combustion air setting is proper. the blower
will start running.

remove jumper
Jump across pressure
switch terminals
If main burner fires. they could cause the heater to burn up. If left in place.
1. attach millivolt meter
and read pilot output
If above 500mV.
White – Negative
Red + Positive
Pilot Load (500mV± 100)
Pilot generator connected to valve-Power
applied to pilot solenoid.
remove jumper
If main burner does not
fire.
replace pilot generator
Raw Output (700mV± 100)
Pilot generator disconnected from valve (knob
must be held down to keep pilot on). gas pressure.ELECTRICAL .
Jump across each
high limit and remove
jumper
Replace high limit that
caused heater to fire
1
2
3
44
If pilot burner
does not light
Check gas supply.
Relight pilot
Replace
gas
valve
If pilot burner stays on
Problem is a wire or
component short to
cabinet or low gas
pressure
If main burner does
NOT fire. Jumpers are for temporary check only.
remove jumper
If main burner does not
fire. check
gas pressure. Gas valve must be in "ON" position.
TP(Thermopile-Robertshaw)
PP(Power Pile-Honeywell)
TH TP – Common
TH PP – Common
Main Valve Load (200mV± 100)
Control/Limit circuit closed (All switches "ON")
TP(Thermopile-Robertshaw)
PP(Power Pile-Honeywell)
TH TP – Common
TH PP – Common
.
Also check for insects
or debris in pilot output
If burner does not remain
lit.
replace gas valve
If below 500mV.
Light pilot
If pilot burner goes out
when main burner lights
or when gas valve knob
is released
If pilot burner remains lit
Jump across both "TH"
wires on gas valves
If main burner fires. gas
line size.
2.
remove jumper
Replace thermostat
Remove both "TH"
wires from gas valve.STANDING PILOT MILLIVOLT
POOL OR SPA HEATER
ELECTRICAL CHECK WITH MILLIVOLT GAS VALVE
CAUTION: For qualified service personnel only. remove jumper
Clean filter
Jump across thermostat
Check for adequate water
flow from filter
Replace pressure switch
If main burner fires. Thermostat set higher than pool water temperature.. Filter must be on with adequate water flow through heater.
3.. Also check
for insects or debris in
the pilot burner
If output is still low.

limit controller.e. thermostat
(controller) and wiring.G. Lockout is used on L.
CALL FOR HEAT ENDS
SYSTEM SHUTS OFF?
YES
NO
MAIN BURNER LIGHTS?
YES
TROUBLESHOOTING
ENDS
• Check continuity of ignition cable and ground wire.
• Check electrical connections between PC board and pilot operator on gas control. If no voltage.
TURN THERMOSTAT
(CONTROLLER) TO CALL
FOR HEAT
POWER TO PC BOARD?
(24 V NOMINAL)
YES
NOTE: Before troubleshooting. i. If okay.
START
TURN GAS SUPPLY OFF.
• Check electrical connections between PC board and gas control.
• Check for 24 VAC across PV-MV/PV terminals on PC board.P.ELECTRONIC IGNITION IID
WARNING HIGH VOLTAGE
For qualified technicians ONLY
NOTE: Some heaters may be equipped with an ignition module that shuts off pilot
gas if pilot fails to light. if not.
NOTE: If ground is poor or erratic. familiarize yourself with the start-up and check-out
procedure.
SYSTEM RUNS UNTIL
CALL FOR HEAT ENDS?
YES
NO
NOTE: IF PC board goes into lockout.
Spark Okay?
YES
NO
Replace the PC board.
• Remove MV lead at module. supply tubing and pressures are
good. if not.
replace gas control. if valve closes.
NO
• Check for 24 VAC across MV-MV/PV terminals. shutdowns may occur occasionally even though
operation is normal at the time of checkout. interrupt power to heater. replace gas valve. flow switch etc. and correct. ceramic insulator and gap. replace
gas valve or gas control operator. low voltage transformer.
• Check ignition cable.
• Check boot of the ignition cable for signs of melting or buckling. reset system. replace PC board.
Pull ignition lead and check spark at PC board. If voltage is okay. ground wiring.ELECTRICAL . Take protective
action to shield cable and boot from excessive temperatures.
models.
NO
SPARK ACROSS
IGNITER/SENSOR GAP?
YES
NO
TURN GAS SUPPLY ON
PILOT BURNER LIGHTS?
YES
NO
Check line voltage power.
• Check that all manual gas valves are open. and pilot burner orifice is not blocked. reset system.
• Check for proper thermostat (controller) operation.
• If checks are okay. replace module. Make sure that the line voltage is NOT 208 VAC. To reset.
• Check that pilot flame covers flame rod and is steady and blue.
NOTE: If PC board goes into lockout. recheck temperature controller and
wiring. replace PC board.
45
. pilot gas valve.

it is important that you supply the heater model number. completely filled in with the heater
serial number..
NOTE: To supply you with the correct part. and shipped to the
Company freight prepaid.REPLACEMENT PARTS
If determined defective by the Company and within
warranty.SECTION 6 .
Any part returned for replacement under standard
company warranties must be properly tagged with a
return parts tag. model number. etc.
MANUFACTURER:
2151 EASTMAN AVENUE
OXNARD. CA 93030
47
. a like part or equal substitution will be
returned. freight collect. serial
number and type of gas when applicable. Credit will not be issued.